======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.0.25787/11390 is trying to acquire lock:
ffffffff8e8837a0 (fs_reclaim){+.+.}-{0:0}, at: prepare_alloc_pages+0x152/0x650

but task is already holding lock:
ffff888115e7cf78 (&vma_lock->rw_sema){++++}-{4:4}, at: hugetlb_fault+0x4c1/0x1670

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #8 (&vma_lock->rw_sema){++++}-{4:4}:
       down_write+0x96/0x200
       __hugetlb_zap_begin+0x317/0x3a0
       unmap_vmas+0x331/0x6a0
       exit_mmap+0x280/0xa10
       __mmput+0x118/0x430
       exit_mm+0x168/0x220
       do_exit+0x6a2/0x23c0
       do_group_exit+0x21b/0x2d0
       get_signal+0x1284/0x1330
       arch_do_signal_or_restart+0xbc/0x830
       exit_to_user_mode_loop+0x86/0x480
       do_syscall_64+0x32d/0xf80
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #7 (&mm->mmap_lock){++++}-{4:4}:
       __might_fault+0xcb/0x130
       _copy_from_user+0x28/0xb0
       csum_and_copy_from_iter_full+0x1e7/0x1f00
       ip_generic_getfrag+0x149/0x2d0
       __ip6_append_data+0x36be/0x3c50
       ip6_append_data+0x10f/0x280
       rawv6_sendmsg+0x12d3/0x18e0
       ____sys_sendmsg+0x80a/0x9f0
       ___sys_sendmsg+0x2a5/0x360
       __x64_sys_sendmsg+0x1bd/0x2a0
       do_syscall_64+0x14d/0xf80
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #6 (sk_lock-AF_INET6){+.+.}-{0:0}:
       lock_sock_nested+0x48/0x100
       inet_shutdown+0x6a/0x390
       nbd_mark_nsock_dead+0x2e9/0x560
       sock_shutdown+0x15e/0x260
       nbd_clear_sock+0x24/0x170
       nbd_config_put+0x2dd/0x580
       nbd_genl_connect+0x19d5/0x1cf0
       genl_family_rcv_msg_doit+0x22a/0x330
       genl_rcv_msg+0x61c/0x7a0
       netlink_rcv_skb+0x232/0x4b0
       genl_rcv+0x28/0x40
       netlink_unicast+0x80f/0x9b0
       netlink_sendmsg+0x813/0xb40
       ____sys_sendmsg+0x972/0x9f0
       ___sys_sendmsg+0x2a5/0x360
       __x64_sys_sendmsg+0x1bd/0x2a0
       do_syscall_64+0x14d/0xf80
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #5 (&nsock->tx_lock){+.+.}-{4:4}:
       __mutex_lock+0x19f/0x1300
       nbd_queue_rq+0x37b/0x1100
       blk_mq_dispatch_rq_list+0xa70/0x1910
       __blk_mq_sched_dispatch_requests+0xdcc/0x1600
       blk_mq_sched_dispatch_requests+0xd7/0x190
       blk_mq_run_hw_queue+0x348/0x4f0
       blk_mq_dispatch_list+0xd16/0xe10
       blk_mq_flush_plug_list+0x48d/0x570
       __blk_flush_plug+0x3ed/0x4d0
       __submit_bio+0x28d/0x580
       submit_bio_noacct_nocheck+0x2f4/0xa70
       block_read_full_folio+0x599/0x830
       filemap_read_folio+0x137/0x3b0
       do_read_cache_folio+0x358/0x590
       read_part_sector+0xb6/0x2b0
       adfspart_check_ICS+0xa5/0xa40
       bdev_disk_changed+0x7ba/0x1550
       blkdev_get_whole+0x380/0x510
       bdev_open+0x31e/0xd30
       blkdev_open+0x470/0x610
       do_dentry_open+0x785/0x14e0
       vfs_open+0x3b/0x340
       path_openat+0x2e08/0x3860
       do_file_open+0x23e/0x4a0
       do_sys_openat2+0x113/0x200
       __x64_sys_openat+0x138/0x170
       do_syscall_64+0x14d/0xf80
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #4 (&cmd->lock){+.+.}-{4:4}:
       __mutex_lock+0x19f/0x1300
       nbd_queue_rq+0xc6/0x1100
       blk_mq_dispatch_rq_list+0xa70/0x1910
       __blk_mq_sched_dispatch_requests+0xdcc/0x1600
       blk_mq_sched_dispatch_requests+0xd7/0x190
       blk_mq_run_hw_queue+0x348/0x4f0
       blk_mq_dispatch_list+0xd16/0xe10
       blk_mq_flush_plug_list+0x48d/0x570
       __blk_flush_plug+0x3ed/0x4d0
       __submit_bio+0x28d/0x580
       submit_bio_noacct_nocheck+0x2f4/0xa70
       block_read_full_folio+0x599/0x830
       filemap_read_folio+0x137/0x3b0
       do_read_cache_folio+0x358/0x590
       read_part_sector+0xb6/0x2b0
       adfspart_check_ICS+0xa5/0xa40
       bdev_disk_changed+0x7ba/0x1550
       blkdev_get_whole+0x380/0x510
       bdev_open+0x31e/0xd30
       blkdev_open+0x470/0x610
       do_dentry_open+0x785/0x14e0
       vfs_open+0x3b/0x340
       path_openat+0x2e08/0x3860
       do_file_open+0x23e/0x4a0
       do_sys_openat2+0x113/0x200
       __x64_sys_openat+0x138/0x170
       do_syscall_64+0x14d/0xf80
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #3 (set->srcu){.+.+}-{0:0}:
       __synchronize_srcu+0xca/0x300
       elevator_switch+0x1e8/0x7a0
       elevator_change+0x2cc/0x450
       elevator_set_default+0x36c/0x430
       blk_register_queue+0x366/0x430
       __add_disk+0x677/0xd50
       add_disk_fwnode+0xfb/0x480
       nbd_dev_add+0x72c/0xb50
       nbd_init+0x168/0x1f0
       do_one_initcall+0x250/0x8d0
       do_initcall_level+0x104/0x190
       do_initcalls+0x59/0xa0
       kernel_init_freeable+0x2a6/0x3e0
       kernel_init+0x1d/0x1d0
       ret_from_fork+0x51e/0xb90
       ret_from_fork_asm+0x1a/0x30

-> #2 (&q->elevator_lock){+.+.}-{4:4}:
       __mutex_lock+0x19f/0x1300
       elevator_change+0x1b3/0x450
       elevator_set_none+0xb5/0x140
       blk_mq_update_nr_hw_queues+0x5e7/0x1a60
       nbd_start_device+0x17f/0xb10
       nbd_genl_connect+0x165b/0x1cf0
       genl_family_rcv_msg_doit+0x22a/0x330
       genl_rcv_msg+0x61c/0x7a0
       netlink_rcv_skb+0x232/0x4b0
       genl_rcv+0x28/0x40
       netlink_unicast+0x80f/0x9b0
       netlink_sendmsg+0x813/0xb40
       ____sys_sendmsg+0x972/0x9f0
       ___sys_sendmsg+0x2a5/0x360
       __x64_sys_sendmsg+0x1bd/0x2a0
       do_syscall_64+0x14d/0xf80
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #1 (&q->q_usage_counter(io)#70){++++}-{0:0}:
       blk_alloc_queue+0x546/0x680
       __blk_mq_alloc_disk+0x197/0x390
       nbd_dev_add+0x499/0xb50
       nbd_genl_connect+0x962/0x1cf0
       genl_family_rcv_msg_doit+0x22a/0x330
       genl_rcv_msg+0x61c/0x7a0
       netlink_rcv_skb+0x232/0x4b0
       genl_rcv+0x28/0x40
       netlink_unicast+0x80f/0x9b0
       netlink_sendmsg+0x813/0xb40
       ____sys_sendmsg+0x972/0x9f0
       ___sys_sendmsg+0x2a5/0x360
       __x64_sys_sendmsg+0x1bd/0x2a0
       do_syscall_64+0x14d/0xf80
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #0 (fs_reclaim){+.+.}-{0:0}:
       __lock_acquire+0x15a5/0x2cf0
       lock_acquire+0xf0/0x2e0
       fs_reclaim_acquire+0x71/0x100
       prepare_alloc_pages+0x152/0x650
       __alloc_frozen_pages_noprof+0x12f/0x380
       only_alloc_fresh_hugetlb_folio+0x132/0x450
       alloc_surplus_hugetlb_folio+0xc6/0x350
       alloc_hugetlb_folio+0xc8f/0x1700
       hugetlb_no_page+0xd87/0x20f0
       hugetlb_fault+0x74e/0x1670
       handle_mm_fault+0x202b/0x3310
       do_user_addr_fault+0xa73/0x1340
       exc_page_fault+0x6a/0xc0
       asm_exc_page_fault+0x26/0x30

other info that might help us debug this:

Chain exists of:
  fs_reclaim --> &mm->mmap_lock --> &vma_lock->rw_sema

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  rlock(&vma_lock->rw_sema);
                               lock(&mm->mmap_lock);
                               lock(&vma_lock->rw_sema);
  lock(fs_reclaim);

 *** DEADLOCK ***

3 locks held by syz.0.25787/11390:
 #0: ffff888077b79b88 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x1d1/0x500
 #1: ffff8881626b0218 (&hugetlb_fault_mutex_table[i]){+.+.}-{4:4}, at: hugetlb_fault+0x3d2/0x1670
 #2: ffff888115e7cf78 (&vma_lock->rw_sema){++++}-{4:4}, at: hugetlb_fault+0x4c1/0x1670

stack backtrace:
CPU: 0 UID: 0 PID: 11390 Comm: syz.0.25787 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150
 print_circular_bug+0x2e1/0x300
 check_noncircular+0x12e/0x150
 __lock_acquire+0x15a5/0x2cf0
 lock_acquire+0xf0/0x2e0
 fs_reclaim_acquire+0x71/0x100
 prepare_alloc_pages+0x152/0x650
 __alloc_frozen_pages_noprof+0x12f/0x380
 only_alloc_fresh_hugetlb_folio+0x132/0x450
 alloc_surplus_hugetlb_folio+0xc6/0x350
 alloc_hugetlb_folio+0xc8f/0x1700
 hugetlb_no_page+0xd87/0x20f0
 hugetlb_fault+0x74e/0x1670
 handle_mm_fault+0x202b/0x3310
 do_user_addr_fault+0xa73/0x1340
 exc_page_fault+0x6a/0xc0
 asm_exc_page_fault+0x26/0x30
RIP: 0033:0x7f3075c6a2f8
Code: 25 00 00 00 00 48 8d b8 d8 fe ff ff 4c 89 74 24 50 e8 5c 3b 0d 00 85 c0 75 13 48 8b 84 24 80 00 00 00 48 8b b4 24 c0 00 00 00 <48> 89 30 64 f0 83 2c 25 a0 ff ff ff 01 4c 8b 74 24 50 e9 91 f5 ff
RSP: 002b:00007fff8f6fe8d0 EFLAGS: 00010246
RAX: 0000200000000080 RBX: 0000000000000002 RCX: 000000000000002a
RDX: 3843122af231fc0a RSI: 0000000000000000 RDI: 000055557547c3d8
RBP: fffffffffffffffe R08: 0000001b33820000 R09: 000000000000000f
R10: 00001fffffffffff R11: 0000000000000006 R12: 00007fff8f6fe9f0
R13: 00007f307601609c R14: 00000000002401a0 R15: 00007f3076016090
 </TASK>
